Well pump jack



Sept. 3,1340. J. M. NESBITT ET AL 2,213,323

WELL PUMP JACK Filed Oct. 3l, 1938 Patented Sept. 3, 1940 l Y y l UNITED*srArss rrsNr ori-ics WELL PUMP JACK Jerry M. Nesbitt and .lohn 0.Andree, Wichita Falls, Tex., assignors to JJ'. C. Halbert ApplicationOctober 3l, 1938, Serial No. 237,958

5 Claims. (Cl. 308-21) This invention relates to loil well equipment asbeing positioned at equalheights above the and has particular referenceto pump jacks and base 2 to define a horizontal plane. Moreover, moreespecially to pump jacks of the walking the parallel members' and 6 arearranged, as beam type. illustrated in Figure -3, in such a manner thati1 The primary object of the invention is in the sides a and b of eachextend upwardly, Whereas 5 provision of a simplified construction forpump the other sides c and d, extend toward each other, jacks which ismade possible by departures from the purpcse f Which is t0 DrOVide atrack fOr the conventional construction as herein described. IOclerassembly l Which Operates therecn- Another object of the inventionresides in the At the ends 0f the tracks 5 and 6 there are le provision0f a jack of the bearingless type which provided integral upright checks8 and 9 which l0 in Operation normally maintains a straight line serveas stops for the rocker 1 if the latter should vertical movement of thepolish rod and at the become disengaged frem the attachment means sametime provides a device of this character in Which Will be described. iwhich the walking beam may easily be shifted The rOClier assembly l iscomprised Of a Dair l such as necessary in the pulling of the rods, orOf spaced Crcss members lll and ll laterally and 15 readjusting of thedevice after the rods have rigidly secured, such as by Welding, t0 theunderbeen replaced. side of the Walking beam l2 which is positioned Yetanother object of the invention resides in parallel tO the tracks 5 and5. At the Outer ends the provision of a construction for pump jacks 0fthe crOss members lll and ll, depending arcs n es in which there 'is noappreciable Wear 0f the i3 and M are Welded or otherwise secured for 20Working parts and one in Which lubrication is Operation 0n the tracks 5and l, thus prcvidng unnecessary for successful Operation an oscillatingsupport for the walking beam l2.

Further, the invention seeks to. provid@ a, Between the cross members l0and Il of the rugged Construction for a, pump jack Capable 0f rockerassembly l therev are vertically disposed being easily repaired, theonly material ordinarily plates l5 and l5, illustrated in Figures 1 and2, 25 necessary for repairing being short sections o1" fOr making theassembly mOre rigid as Well aS wireline, providing anchors for Wirelines Il which are Other and lesser objects will become manifest securedtheretc by Cable Clamps i8. The Wire as the description proceeds takenin connection lines ll eXtend arOund the CrOss member l@ :ad with theaccompanying drawing wherein; nearest the stops 8 and 9, under the arcsI3 and 30 Figure l is an elevational view of the invent it, andterminate in Wire rOlOe Connectors, One tion and illustrating thesupporting frame or 0f Which is illustrated in Figure l, and are standin vertical section threadedly `and adjustably attached to the Figure 2is a plan view of the rocker construcbracket 4 by adjustment nuts |9-The Wire lines tion employed in supporting the Walking beam ll are fOrthe Dulpcse 0f yielding t0 the displaee- 35 on the stand, and ment ofthe center of oscillation of the beam, Figure 3 is an elevational Viewof the rocker yet preventing rectilinear movement in adirecconstruction, taken 0n lines 3 3 0f Figure 1, tion Opposite thepoint of attachment 0f the lines Continuing with a more detaileddescription of and Stand. 4g the drawing, the numeral l designates thesup- At the end e Of the Walking beam l2, opposite 40 porting frame orstand having a base 2 which the bracket il, there is POSitiOned a mulehead is substantially rectangular in shape, as incli- .2t Which supportsa mule head bridle 2l and in cated in Figure i. Upright legs 3 areprovided at; turn a polish rod 22, the connection between each or" thecorners of Ithe base 2 and are inclined the last named elements being bymeans of a toward tn@ Center. Ai; the upper ends and beconventionalpolish rod adjuster 23, as illustrated 45 tween two of the legs 3 thereis secured an angle in Figure l. The Other end f 0f' the Walking beamiron or bracket e, as illustrated in cross section l? is provided WithanOtller head 24 fOr supportm Figure 1, which, in addition to serving asa. ins a counter balance 0r Weight 25 which is concross member, is usedfor another purpose to be nected thereto by means 0f a length Of Wireline.

related as the description proceeds. y Attached to the underside of thewalking beam 50 ther cross members 5 and t are likewise arl2intermediate the ends e and f and between the ranged between the upperends of the legs 3 cross members IG and Il there is rigidly securedwhich support the bracket l and other of the legs a down bar 26 whichhas at its lower end a shoe 3 in such a manner that these members 5 and6 2l for imparting an oscillating movement to the are parallel Withrespect to each other as Well walking beam I2. 55

In operation the shoe 2'! is connected to a reciprocating rod line 2S bymeans of a bridle 2E imparting, through the medium of the elementsdescribed, vertical rectilinear movement to the polish rod 22 as well asto the counter balance Describing briefly the operation oi theinvention; the curves of the mule head face and of the arcs i3 and illare so calculated that as the beam I2 is rocked to displace the centerof oscillation thereof forward, the resultant movement is a forwardthrust of the beam toward the lowermost point as against a downward andinward movement if the beam `were oscillated on a xed fulcrum. Theresult is therefore, that there would be no tendency of the cable 2i todivert from a strictly vertical plane. On the up stroke of the forwardend of the beam, the curve of the mule head face is such as tocompensate for displacement of the center of oscillation or the beam bymoving along a given point in direct alignment above the well, thuscausing the line 2| to move undeviatingly in a vertical plane. Thecables il prevent other than the required displacement of theoscillating point of the beam for the described results.

Obviously, the curvature oi the arcs E3 and itl, the height of therocker assembly '6, and the length of the beam i2, determine the shapesoi the heads 28 and but in carrying out the invention these componentsniay be varied to meet diierent requirements and yet provide for thetrue alignment of the polish rod Maniiestly, the structure herein shownand described is capable of considerable changes and modifications fromtime to time by those skilled in the art and such changes andmodifications as may be resorted to falling within the spirit and intentof the invention may also be considered as falling within the scope ofthe ,appended claims.

What is claimed is:

l. In a pump jack having a stand and a walking beam, a bearing for saidwalking beam comprising an arcute rocker attached to the said walkingbeam, a pair of tracks dening a hori- Zontal plane and forming anupperpart oi the said stand for supporting the said rocker, wherebymovement of the latter on said tracks will effect displacement of thecenter of oscillation of said beam, and flexible lines connected to saidstand and said rocker for conning the said rocker for operation on thesaid tracks.

2. In a pump jack having a stand and a walking beam, a bearing for saidwalking beam oomprising a pair of parallel tracks mounted on the saidstand, a rocker in fixed relation to and supporting the said beam, apair of arcs forming a part of the said rocker for operation on the saidtracks, and whereby the center of oscillation of said beam will bedisplaced, and flexible lines connected to said stand and to said rockerfor restricting the said rocker against rectilinear movement on the saidtracks.

3. In a pump jack having a stand and a walking beam, a bearing for saidwalking beam comprising a pair of horizontal and parallel trac mountedat the top of the said stand, a rocker for operation cn the said trackscomprising a pair of spaced cross members attached to the said beam anddepending arcs attached to the outer ends of the said cross members, anda plurality of ilexible lines attached to the said stand and the saidrocker lor preventing rectilinear' movement in a direction opposite theattachment of the said lines and the said stand.

4. In a well pump jack. having a walking beam and supporting structure,a bearing for said walking beam comprising parallel tracks carriec bysaid supporting structure on either side of the major axis ci said beam,an arcuate rocker carried by said beain to roll upon said tracks,whereby to eiiect displacement of thc center of oscillation of saidbeam, flexible lines for constraining said rocker to operate on saidtracks to effect displacement of lthe operative end of said beam andmeans to adjust said latter means.

5. A well pump jack having a walking beam and supporting structure, abearing lor said walking beam including parallel tracks carried by saidsupporting structure on either side of the major axis of said beam, anarcuate rocker carried by said beam to bear upon said tracks, ilexiblelines for constraining said rocker to operate on said tracks to eflectdisplacement or" the operative end oi said beam, means to adjust saidlatter means and a shoe suspended below said walk,- ing beam having acurved surface corresponding to that of said arcuate rocker.

JERRY lVl. NESBITT. JOHN O. ANDREE.

